Telephone signaling system.



W. G. BLAUVELT.

TELEPHONE SIGNALING SYSTEM.

.APPLIOATI 0N FILED MAY 4, 1911.

Patented Mar. 11, 1913 UNITED STAT PATENT OFFICE.

' w nner! 4;. BLAUvE J'r, or New YORK, N. Y., ASSIGNOR arc-AMERICAN TELEPHoNE AND TELEGRAPH COMPANY, A CORPORATION or NEW YORK.

TELEPHONE SIGNALING' SYSTEM;

To all whomit may concermj Y i Be it known that I, IVILLIAM G B imp-.- vsL'r, residing at New Yorlgborough of Manhattan, in thecounty of New York and State of New York, have inventedcertain Improvements in Telephone S gnaling Systems, oi which the'following IS a specifica tion.

In telephone systems," signaling subhaving a rotatable contact device, which.

gives alternate periods. during which ringing current is applied the line and is cut off therefrom. Obviously, any call, when it reaches .thepoint a't w'hich.ringing over the called lineis to; begin, .may find the interrupter upon the silent segment of the'eontact device, and no ringing current will-be available until the generator; segmentcomes into the circuit.- ,The periods ofco'nne'ction and disconnection areoftenof two-and four seconds duration, respfeet-ively and it'will I be seen that in this case during two-thirds" of. the time there will be a delay in startingthe signal averaging twoseconds, whichis.

wholly wasted. -My.invention avoids this loss by rendering immediately available at the commencement of theringing stage an Means at the central station C for connect,

' 'ing the lines for'conveisation may be any' 7 which is desirable. I have illustrateda uninterrupted or continuous supply of current, this acting. for a definite time, after which the interrupter is joined to the line, and the signaling operation will proceed as usuaL- The invention is equally applicable to manual, automatic 'flndeombination manual and automatic systems, but, since the principle is the same in allfand the manual furnishes, the simplest embodiment, only that will be herein described. This .illustrated by the diagrammatic drawing in which merely the moregessential elements appear.

Telephone substations with their lines and customary, associated apparatus appear at Aand B,'thesje.being considered'as the calling and called" stations, respectively;

portion of 'a manual cord circuit 0, provided with an answering plug P and a calling Specification of Letters Patent.

'. plug-P (Associated with the cord circuit fisl'an automatic switching mechanism D, the'. arrangement and functions of which will depend upon thefch'aracter' of the sys- -tem'o,f=-which it is a part,'.=but which, in any event, isadapted to assume suceessive con-.

trolling positions i -regular sequence. the pr'esent instance, it" is employed solely as a-means for governingthe 'signaling'of the called subscriber, andforthis, purpose it consistsof a shaft d uponpwhich is fixed a series of camse, theperipheries of which cooperate with springs; flto force them against or permit them to separate from cont-acts g. These cams, springs and contactsall' appear in two places in the draw- Patented Mar. 11,- 191'3. Application filed May 4,1 11. Serial No. 6e4, V, V

ing, in dotted lines in their-actual relation fixed'to their reference letters. The switch' shaft withyits cams maybemoved from position-to position by a"m'otor magnet mactuating ratchet mechanism. Apulsatoi p supplies intermittent current from battery .Bit hrough conductor 10 to theYmotor-mag net and thus rotates the shaft whenever its circuit is completed'atone of the. contacts of the sequence switch D to ground or other return conductor. This ground connection may beat some external point or local to the switchingmec'hanism itself, the cam e controlling the latter condition'and determining the correct stopping points of the switch shaft. When the spring f cooperating with this 'camis separated from the contact 9, this being in the positions indicated by the numerals placed at the 0p posite side of 'thespring irom the contact,

the projection 11 upon said spring lies in a depression 12 in the periphery of the cam, and the'shaft withthe-associated cams is to the shaft 0! and iii-"full lines'at points. most clearly developing the circuitorgani properly positioned. Upon thecompletion ofthe circuit ot'the motor magnet -,m at some point in the system the projection rides out of the depression, and when resting upon elevations of the cam e closes a local circuit for the motor magnet which insures the rotation of the shaft to the next position at which the cams are to stop, regardless of external conditions. The numerals applied to the contacts of the re-' -m aining cams show the positions in which said contacts are closed. Of the other cams,

Y segments 16 of an extra contact cylinder 16- upon the shaft,l 7 of an interrupter or.sig-.

" contact 13 ot a relay R, the windingof nectedto contact-g fofcani e From. the1 'opp'ositecontact's g and jg of cams e and e conductors 1i and l4c,' respectively, lead" a contact gPr'of cam isqjoined to the baclg which is in the thirdcon ductor I ,the cord bet-Ween the free pole of the-central battery and the slee v'e or theca-llingplug;

The front contact131of relay. R is con to brushes 15', 15- cohperating: with narrow naling mechanism I. These-segments are separated by alternate blocks 116 of insu latingmaterial and: are an; connected ground at 16 through the shaft-17; As the cylinder 16 rotates int-he direction of the 'arr0w at a predetermined speed, the brush 15 first" contacts with one of the segments 16, and then, after a definitetime-interval but 'never Simultaneously, the brush 1-15 'con tacts-with another of the segments. [Thus-aground connection aIternateIyapplied to the brushes .with any suitable time intervenin'g, this dcpendingfuponthe relative position of the brushes, thej'spacing of the "segments and the rate of rot'at-ion'o'fthe i n terrupter! Apart from this extra contact device the interrupter may he. as ijlsuah sup-i plying current from the generator- H- and battery 13-, respectiirely, to ;-the ringing. segmentl8 'andsi-lentrseg'r'nent 18*. of a cylinder 18. A' brush 51 9; alternately delivers ,the

current from these elem'entstoa conductor 20 leadingfto contact 9" or cam est. The contact 9* off the sanie 'cfalrrr is joined di-- "rectly tofla. ringing. generatorl This gener-.

atori iHj is illustrated as separate from the generator H, but in practice-theywill preb erably 'beidentical. 'wilI"beseen,'-;ho'wever,'- that'-since there 'is nointerme'diate interrupter; this contact 9 appliesf'r'in'ging current to the-springj coiiperatingwith it differing in character from" the current in terruptedly given at gQ. Spring iff'is included by a conduct-or-2lfin the circuit ofa marginal relay P, with the contactg of earn ,6. Thelsp'ring f and its contact 99 complete the continuity lot the cordl con ductor'lhl for conversation. The cam e by its contactg andaspting f'puts ground upon the tip of the calling plug.w V The switch springsf; -f and f are,united b'ya-comnion 'conductor 22 with; the motor ma-gnet m of the sequence switch D andwith the front contact 23 of relay R;

Let it be assumed thatupon'a call 'fro'msubstation A, the lineof substationB was.

not found in use, and thatiithasj been connected b'y thecordfc with the calling line. A circuit is at the same time completed for the relay R in series withthe cut-oh relay.

of the called line, and the closing of the front contact 13 gives a path fOr current from the pulsator p through conductor 10,

,motor magnet m,,conductor 9. c w

'coperatio'n with the brush 15, '1

and normal switch contact g te ground-.

The switch is thereupon advanced to it second position. W'hat'eVer the position .Of

the -seginents"18,}18", current will. at once 'fiowfr'orn generator H through contact if",

spring f"; conductor 21,=\\'inding of relay -R? (which doesv notrespond) contactf fl spring f cordjconductorL over the-line nf' substation B -and to ground through conductor L sp'ring f? and contaetfgfl-and ringing begins \vithou-t -delay. As soon as.

grounded segment l-ti' of the devic cuitis 'prorid ed. for itheunoton v eluding-conductor =22, springf, contiict g t and condi'i'ctor causihg the switc SLlllle its thirdposition; Hc'rei'i grounded through a segment 16,tlna r'ingremains" for a measured interval of time; sayha'lfa" I second, determined by the i'nterru'pte'r 1- its previously 'descr'ibed,-unt il the. brush 15?;is I

the rotation of the interrupter brings a 3 10 into.

ing of the substation B continuing during this period. .Then:a'fcircuitvfor 'thcfinotor magnet exists by w'ay' of conductor 14*, con} tact- 9*, spring f and conductor 22, and? the switch adi ances to'the fourth positions This disconnects the generator at ZtlnJ'con tact cg? and connects the interrupter; by I inea'ns" of Contact 9? and "conductor QOQ r'es'ulting' in intermittent ringing funtil the called subscriber remoresj the receiver-front its hook. Thenthe-increased current"'- fr0m "either the" generator: H -or ;-batter. y 13, de

d er 18 .theb'rush'l9 contacts with, causes re a Cir c1iiti f0r themotor 'rnagne't hy wny of: 'conductor 22 aiid said contact to ground at the armature offrelny 'Rfiandlthe switch is lay It to close its contactflii, There isn'qw driven to I its fifth; posit-ion, cuttingfott the ringing current at; spring of, disconnecting ground at the. spring 'and closing the. Q

t-alkingcircuit at-the'springff. It Twillbe seen that immediately uponconnection with the, line of the"ca lled subscriber, rin'ging current. will be continuously applied for a time extending between determinable limits, 1

notv less fthan that 3 required for the brushes 15,15? successively cooperate with so! merits i6,- n'or'greater"than gdquble such "time, followed'iby thensual interrupted apr 'ili'cation of current. U ponf the'" completion of conversation the 'relay -R-is defnergized,

in the present instance by the remoral of the plug p fromfits l jack, giving a "circuit for the motor magnet m through the back con-1" magnet circuit through interrupter brush 15, conductor 14 and contact 9 immediatelycauses the assumption of the third position.

I claim: 1

1. The combination with a telephone line and a source of signaling current, of inde pendent-automatic'means 'for applying the signaling current to the line, said signaling current being constantly available at one of said means and intermittently available at another of said means. ,2. The combination with a telephone line I and a source of signaling current, of auto-' matic means for successively ap lying the signaling current to the line, sai signaling current being constantly available at the first applying means and intermittently available at the means by which it is thereafter applied to the line.

I 3. The combination with a suostation telephone line, of automatic means for continuously applying signaling current to the substation line through one connection and for intermittently applying signaling current to the substation line through another connection.

4. The combination'with a telephone line,

[of a source of ringing current, an intering means, automatic switching mechanism associated therewith, a current interrupter and a source of ringin current connected with the switching mec anism through the interrupter. and also having independent connection with the switching mechanism whereby the latter may apply the current either through the interrupter connection or the independent connection.

7. Ina telephone system, line connecting means, a, switching'mechanism associated cuit 'int'o use-for advancin therewith, a current interrupter, a source of,

ringing current connected with the switching mechanism through the interrupter-and also having independent connection with the switching mechanism, and means forming a portion of the interrupter for controlling v the switching mechanism.

8. The combination with telephone lines of a connecting circuit, a mechanism having switching contacts associated with the connecting circuit, said switching mechanism being capable of assuming a plurality of contact actuating positions, means for continuously applying ringin current to the connecting circuit throug one combination of the contacts in one position of the switching mechanism,.and means f r intermittently applying ringing current to the connecting circuit through another combination of the contacts in another position of the switching inechanism.

, 9. The combination with telephone lines, of a connecting circuit, a mechanism having switching contacts associated with the connecting circuit, said switchin mechanism being capable of assuming a p urality of contact actuating positions, means for continuously applying ringing current to the connect ing circuit in one position of the switching mechanism, means for intermittently applying ringing current to the connecting C1I-/ cuit in the succeeding position, means controlledby; the puttingoi the connecting cir the switching mechanism from" its norma' position to its first active position, and means controlled by the means for intermittently applying current for advancing the switching mechanism to another position.

10. In a telephone system, substation lines, a connecting circuit therefor, a sequence switch associated with the connecting circuit and being provided with motor mechanism, a source of ringing current, and a ringing interrupter interposed between the source of current and the sequence switch, said interrupter having a contact de-' vice controll'in the motor mechanism of the sequence switc In testimony whereof, I have signed my name to this specification in the presence of two subscribin wi nesses, this twenty fourth day of pril, 1911.

WILLIAM G. BLAUVELT. \Vitnesses:

SAMUEL RAs IsON, ROBERT S. SUTLIFFE.

Copies of thin-patent may be obtained for five cents each, by addressing the Commissioner ot Patents, i Washington, D 0." 

